138743247 has 4 divisors (see below), whose sum is σ = 184991000. Its totient is φ = 92495496.

The previous prime is 138743243. The next prime is 138743299. The reversal of 138743247 is 742347831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 742347831 = 3 ⋅247449277.

It is not a de Polignac number, because 138743247 - 2² = 138743243 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138743243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23123872 + ... + 23123877.

It is an arithmetic number, because the mean of its divisors is an integer number (46247750).

Almost surely, 2^138743247 is an apocalyptic number.

138743247 is a deficient number, since it is larger than the sum of its proper divisors (46247753).

138743247 is an equidigital number, since it uses as much as digits as its factorization.

138743247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46247752.

The product of its digits is 112896, while the sum is 39.

The square root of 138743247 is about 11778.9323370159. The cubic root of 138743247 is about 517.6910037313.

The spelling of 138743247 in words is "one hundred thirty-eight million, seven hundred forty-three thousand, two hundred forty-seven".